Which design type provides different content URLs for different devices?

The correct answer is adaptive design. This design approach is specifically tailored to deliver different content URLs based on the device accessing the website. Adaptive design utilizes server-side technology to detect the device type and serve optimized layouts and content suited for that device. For instance, a user accessing a site via a smartphone may receive a streamlined version of that site with different content and layout compared to what a desktop user would see.

This method allows for greater control over the user experience and can cater to different operating systems and screen sizes by providing tailored content for each device type. It is particularly effective for sites that want to enhance performance, loading times, and usability for a diverse range of devices.

In contrast, responsive design relies on flexible grids and CSS media queries to adjust a single URL's layout and design dynamically, based on the screen size, rather than serving different URLs. Fixed design maintains the same layout regardless of the device, which can lead to a suboptimal user experience on varying screen sizes. Fluid design, on the other hand, uses percentage-based widths for elements to allow resizing, but it does not deliver different content URLs for different devices.